Alex Mawbeh

I have a 1984 Yamaha V50 Automatic and it has developed a problem where after a few minutes of running it will stall under acceleration. Particularly after a longer period of braking. When given any throttle it doesn’t accelerate and instead cuts out. I have tried cleaning the carbs including the jets, the tank has been cleaned, fuel pipes have been replaced, new air filter and new spark plug. Idles fine and ok for the first few minutes of riding.